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2. Connecting
To connect to Payeer:
1. ​
Register​
in the Payeer system
2. Activate the merchant in the “​
Merchant Settings​
” tab by going to the “Activation” tab and
filling in the following fields:
Name​
: the name of your website, e.g. “Google”. This name will be displayed on your
merchant list and the user’s list when paying an invoice.
Secret key​
: a string of characters for signing data transmitted in the payment
initialization form and checking incoming data when processing a payment.
Domain : your website’s domain name, e.g. “google.com”. The domain name can
only contain Latin letters, numbers, and hyphens. To convert national domain names, use
any punycode converter such as ​
punycoder​
.
3. Confirm your ownership of the website by placing a text file in the website's root directory.
1

3. 4. Fill in the following fields:
Success URL​
: this is the address the customer will be redirected to once payment
has been completed successfully.
Fail URL​
: this is the address the customer will be redirected to in the event of an
error during the payment process or if payment is cancelled.
Status URL​
: the address of the payment processor. This page is where orders can
be marked as paid or, for example, funds can be sent to the customer’s account on your
website.
Key for encrypting additional parameters:​
a secret key for encrypting additional fields,
as well as dynamic success, fail, and status URL’s.
5. Submit the merchant for moderation. Prior to moderation, only the owner of the merchant
can perform payment as long as this person has already logged into Payeer.
Setting up the Merchant
In the "Settings” tab, you can:
1. Enter a new secret code (unfortunately, it is not possible to view the old code for security
reasons, but you can always replace it with a new one).
2. Establish who will pay fees:
2.1. By default: the customer pays the fee for the selected payment method and the
merchant pays a fee to Payeer (by default, 0.95%); the amount of the invoice minus 0.95%
is added to the merchant's account.
2.2. Customer: the payment method's fee and Payeer's fee are both paid by the customer,
and the full price of the invoice is added to the merchant’s account
2.3. Merchant: the payment method's fee and Payeer's fee are both paid by the merchant,
and the price of the invoice minus both fees is added to the merchant’s account.
3. Enter a key for encrypting additional parameters if you are planning to transfer them to the
payment form or you need dynamic interaction addresses (success, fail, or processor’s
address).
4. Enter the addresses of successful and failed payments and the payment processor.
2

4. 5. Select a notification server (by default, the server is selected automatically when a
notification is sent).
In the “Appearance” tab you can disable unneeded sections and payment methods or set
only the currencies you need. Methods unavailable for direct payment of the invoice are
grayed out, but your customer can always add funds to their internal Payeer account and
then pay your invoice from that account. After clicking on these methods, the customer is
provided with detailed instructions on how to return to paying your invoice.
In the “Website connection” tab you can download a ready-made module for your CMS and
find examples for manual connection.
To test a signature that has been generated, you can use the tab of the same name in the
merchant’s settings.
Payment Initialization Form
For switching to the payment page, create the following form:
<form method="post" action="https://payeer.com/merchant/">
<input type="hidden" name="m_shop" value="12345">
<input type="hidden" name="m_orderid" value="1">
<input type="hidden" name="m_amount" value="1.00">
<input type="hidden" name="m_curr" value="USD">
<input type="hidden" name="m_desc" value="dGVzdA==">
<input type="hidden" name="m_sign"
value="9F86D081884C7D659A2FEAA0C55AD015A3BF4F1B2B0B822CD15D6C15B0F0
0A08">
<!--
<input type="hidden" name="form[ps]" value="2609">
<input type="hidden" name="form[curr[2609]]" value="USD">
-->
<!--
<input type="hidden" name="m_params" value="">
-->
<input type="submit" name="m_process" value="send" />
</form>
3

5. Explanation of the Parameters of the Payment Initialization Form
Name Key Description
Merchant URL action The merchant's URL
address
Merchant ID m_shop The merchant’s ID
Payment ID m_orderid In this field, the seller enters
a purchase ID that matches
their invoicing system. Using
a unique number for each
payment is recommended.
The ID can be a line of any
length up to 32 characters
and can contain the
characters “A-Z”, “_”, “0-9”,
and “-”.
Example:​
12345
Payment amount m_amount The amount of the payment
the seller wishes to receive
from the purchaser. The
amount must be greater
than zero. There can only
be two decimal places, and
they must be separated
from the whole number by a
period.
Example:​
1.00
Payment currency m_curr The currency used in the
payment
Potential currencies:​
USD,
EUR, RUB
Payment description m_desc A description of the product
or service. Generated by the
seller. This line is added to
the payment designation.
It is encoded by a base64
algorithm.
Example:​
dGVzdA==
4

6. PHP код:​
<?php echo
base64_encode('test'); ?>
Electronic signature m_sign A security signature used to
check the cohesiveness of
the information obtained and
directly identify the sender.
Example:
9F86D081884C7D659A2FE
AA0C55AD015A3BF4F1B2
B0B822CD15D6C15B0F00
A08
Payment system ID form[ps] The ID of the payment
system for automatic
selection. The ID list can be
found in the ​
Appearance
tab
Example:​
2609
Payment system currency form[curr[psId]] Payment system currency
Example:​
USD
Additional parameters m_params A JSON array of data of
additional parameters
encrypted using the
Rijindael-256 algorithm and
encoded using a base64
algorithm.
Encryption method m_cipher_method Encryption method of
m_params.
Available methods:
● AES-256-CBC
● AES-256-CBC-IV
Additional parameters
Name Key Description
Success URL success_url This is the address the
customer will be redirected
to once payment has been
completed successfully
Fail URL fail_url This is the address the
5

7. customer will be redirected
to in the event of an error in
the payment process or if
payment is cancelled
Status URL status_url The address of the payment
processor. This page is
where orders can be
marked as paid or, for
example, funds can be sent
to the customer’s account
on your website
Additional fields reference An array of additional fields
that must be returned to the
payment processor
Domain of sub-merchant submerchant Domain of sub-merchant
(only for aggregators)
Example of the Creation of a Payment Initialization Form
PHP
<?php
$m_shop = '12345'; // merchant ID
$m_orderid = '1'; // invoice number in the merchant's invoicing system
$m_amount = number_format(1, 2, '.', ''); // invoice amount with two decimal places
following a period
$m_curr = 'USD'; // invoice currency
$m_desc = base64_encode('Test'); // invoice description encoded using a base64
algorithm
$m_key = 'Your secret key';
// Forming an array for signature generation
$arHash = array(
$m_shop,
$m_orderid,
$m_amount,
$m_curr,
$m_desc
);
/*
// Forming an array for additional parameters
$arParams = array(
'success_url' => 'http://google.com/new_success_url',
'fail_url' => 'http://google.com/new_fail_url',
'status_url' => 'http://google.com/new_status_url',
6

8. // Forming an array for additional fields
'reference' => array(
'var1' => '1',
'var2' => '2',
'var3' => '3',
'var4' => '4',
'var5' => '5',
),
//'submerchant' => 'mail.com',
);
// Forming a key for encryption
$key = md5('Key for encrypting additional parameters'.$m_orderid);
// Encrypting additional parameters
//$m_params = urlencode(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256,
$key, json_encode($arParams), MCRYPT_MODE_ECB)));
// Encrypting additional parameters using AES-256-CBC (for >= PHP 7)
$iv = substr(hash('sha256', $key), 0, 16);
$m_params = urlencode(base64_encode(openssl_encrypt(json_encode($arParams),
'AES-256-CBC', $key, OPENSSL_RAW_DATA, $iv)));
// Adding parameters to the signature-formation array
$arHash[] = $m_params;
*/
// Adding the secret key to the signature-formation array
$arHash[] = $m_key;
// Forming a signature
$sign = strtoupper(hash('sha256', implode(':', $arHash)));
$arGetParams = array(
'm_shop' => $m_shop,
'm_orderid' => $m_orderid,
'm_amount' => $m_amount,
'm_curr' => $m_curr,
'm_desc' => $m_desc,
'm_sign' => $sign,
//'m_params' => $m_params,
//'m_cipher_method' => 'AES-256-CBC-IV',
//'form[ps]' => '2609',
//'form[curr[2609]]' => 'USD',
);
$url = 'https://payeer.com/merchant/?'.http_build_query($arGetParams);
echo $url;
7

9. ?>
<form method="post" action="https://payeer.com/merchant/">
<input type="hidden" name="m_shop" value="<?=$m_shop?>">
<input type="hidden" name="m_orderid" value="<?=$m_orderid?>">
<input type="hidden" name="m_amount" value="<?=$m_amount?>">
<input type="hidden" name="m_curr" value="<?=$m_curr?>">
<input type="hidden" name="m_desc" value="<?=$m_desc?>">
<input type="hidden" name="m_sign" value="<?=$sign?>">
<?php /*
<input type="hidden" name="form[ps]" value="2609">
<input type="hidden" name="form[curr[2609]]" value="USD">
*/ ?>
<?php /*
<input type="hidden" name="m_params" value="<?=$m_params?>">
<input type="hidden" name="m_cipher_method" value="AES-256-CBC-IV">
*/ ?>
<input type="submit" name="m_process" value="send" />
</form>
Java
import java.util.*;
import java.lang.*;
import java.security.MessageDigest;
import java.util.Base64;
class Rextester
{
public static void main(String args[])
{
String m_shop = "12345";
String m_orderid = "1";
String m_amount = "1.00";
String m_curr = "USD";
String m_desc = "Test invoice";
String m_key = "Your secret key'";
String m_desc64 = Base64.getEncoder().encodeToString(m_desc.getBytes());
String m_sign = sha256(m_shop + ":" + m_orderid + ":" + m_amount + ":" + m_curr +
":" + m_desc64 + ":" + m_key);
String url = "https://payeer.com/merchant/?m_shop=" + m_shop + "&m_orderid=" +
m_orderid + "&m_amount=" + m_amount + "&m_curr=" + m_curr + "&m_desc=" +
m_desc64 + "&m_sign=" + m_sign;
System.out.println(url);
8

10. }
public static String sha256(String base)
{
try
{
MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte[] hash = digest.digest(base.getBytes("UTF-8"));
return bytesToHex(hash).toUpperCase();
}
catch(Exception ex)
{
throw new RuntimeException(ex);
}
}
public static String bytesToHex(byte[] bytes)
{
StringBuffer result = new StringBuffer();
for (byte b : bytes) result.append(Integer.toString((b & 0xff) + 0x100,
16).substring(1));
return result.toString();
}
}
Forming a Digital Signature
A digital signature is a line of characters made up of values of transmitted variables, with the
addition of a secret key at the end, divided by the character “:” (colon) and hashed using an
SHA-256 algorithm. All letters are capitalized.
Sample Signature Formation
PHP
<?php
$m_shop = '12345'; // merchant ID
$m_orderid = '1'; // invoice number in the merchant's invoicing system
$m_amount = number_format(1, 2, '.', ''); // invoice amount with two decimal places
following a period
$m_curr = 'USD'; // invoice currency
$m_desc = base64_encode('Test'); // invoice description encoded using a base64
algorithm
$m_key = 'Your secret key';
$arHash = array(
$m_shop,
9

11. $m_orderid,
$m_amount,
$m_curr,
$m_desc
);
// Adding additional parameters if you have entered them
if (isset($m_params))
{
$arHash[] = $m_params;
}
// Adding the secret key
$arHash[] = $m_key;
// Forming a signature
$sign = strtoupper(hash('sha256', implode(":", $arHash)));
Python 2
import binascii
from hashlib import sha256
m_shop = "12345"
m_orderid = "1"
m_amount = "1.00"
m_curr = "USD"
description = "Test"
m_desc = binascii.b2a_base64(description.encode('utf8'))[:-1].decode()
m_key = "Secret key"
list_of_value_for_sign = map(str, [m_shop, m_orderid, m_amount, m_curr, m_desc,
m_key])
result_string = ":".join(list_of_value_for_sign)
sign_hash = sha256(result_string)
sign = sign_hash.hexdigest().upper()
C#
using System;
using System.Security.Cryptography;
using System.Text;
namespace Rextester
10

12. {
public class Program
{
public static void Main(string[] args)
{
var m_shop = "12345";
var m_orderid = "1";
var m_amount = "1.00";
var m_curr = "USD";
var m_desc = Base64Encode("Test");
var m_key = "Secret key";
var arr = new string[] { m_shop, m_orderid, m_amount, m_curr, m_desc, m_key };
var sign = sign_hash(String.Join(":", arr));
}
public static string sign_hash(string text)
{
byte[] data = Encoding.Default.GetBytes(text);
var result = new SHA256Managed().ComputeHash(data);
return BitConverter.ToString(result).Replace("-","").ToUpper();
}
public static string Base64Encode(string plainText)
{
var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
return System.Convert.ToBase64String(plainTextBytes);
}
}
}
Payment Processor
The payment processor is designated to process payments on your website. This page is
where orders can be marked as paid or, for example, funds can be sent to the customer’s
account.
Sample Payment Processor
PHP
<?php
// Rejecting queries from IP addresses not belonging to Payeer
if (!in_array($_SERVER['REMOTE_ADDR'], array('185.71.65.92', '185.71.65.189',
'149.202.17.210'))) return;
if (isset($_POST['m_operation_id']) && isset($_POST['m_sign']))
11

13. {
$m_key = 'Your secret key';
// Forming an array for signature generation
$arHash = array(
$_POST['m_operation_id'],
$_POST['m_operation_ps'],
$_POST['m_operation_date'],
$_POST['m_operation_pay_date'],
$_POST['m_shop'],
$_POST['m_orderid'],
$_POST['m_amount'],
$_POST['m_curr'],
$_POST['m_desc'],
$_POST['m_status']
);
// Adding additional parameters to the array if such parameters have been
transferred
if (isset($_POST['m_params']))
{
$arHash[] = $_POST['m_params'];
}
// Adding the secret key to the array
$arHash[] = $m_key;
// Forming a signature
$sign_hash = strtoupper(hash('sha256', implode(':', $arHash)));
// If the signatures match and payment status is “Complete”
if ($_POST['m_sign'] == $sign_hash && $_POST['m_status'] == 'success')
{
// Here you can mark the invoice as paid or transfer funds to your customer
// Returning that the payment was processed successfully
ob_end_clean(); exit($_POST['m_orderid'].'|success');
}
// If not, returning an error
ob_end_clean(); exit($_POST['m_orderid'].'|error');
}
The payment processor must return m_orderid with a status of “success” or
“error” as indicated in the above example. Otherwise a notification will be sent
until a correct response has been obtained.
12

14. To ensure the security of queries accepted from your website, be sure to install
a check of the sender’s IP address. You can get a list of our IP addresses here
https://payeer.com/merchant/ips.txt
You can always see how your payment processor has responded to our payment notification
by going to ​
History​
, clicking on your merchant’s tab, and then clicking on the notification
button.
Descriptions of Payment Processor Parameters
Name Key Description
Internal payment number m_operation_id A unique payment number
in the Payeer system
Example:​
123456
Method of payment m_operation_ps The ID of the method of
payment used to make the
payment. All methods of
payment can be viewed in
the “Appearance” tab under
merchant settings
Date and time of transaction m_operation_date The date and time of the
transaction (UTC+3)
Example:​
21.12.2012 21:12
Date and time of payment m_operation_pay_date The date and time of the
payment (UTC+3)
Example:​
21.12.2012 21:12
Merchant ID m_shop The merchant ID registered
in the Payeer system
Payment ID m_orderid The order ID following the
merchant’s invoicing system
Example:​
12345
Payment amount m_amount The amount of the payment
Example:​
1.00
Payment currency m_curr The currency used in the
payment
13

15. Potential currencies:​
USD,
EUR, RUB
Payment description m_desc A description of the product
or service encoded using a
base64 algorithm
Example:​
dGVzdA==
Payment status m_status The status of the payment in
the Payeer system
Values used: ​
success
Electronic signature m_sign A security signature used to
check the cohesiveness of
the information obtained and
directly identify the sender
Example:
9F86D081884C7D659A2FE
AA0C55AD015A3BF4F1B2
B0B822CD15D6C15B0F00
A08
Customer’s email address client_email The email address of the
customer who paid the
invoice
Example:
customer@email.com
Customer's account number client_account The Payeer account number
of the customer who paid
the invoice
Example:​
P1000001
Transfer ID transfer_id The transaction ID of the
transfer to the merchant's
account for this payment
Example:​
12345
Transfer amount summa_out The amount of money,
minus all fees, transferred to
the merchant's account for
this payment
14

16. Example:​
1.00
Additional parameters m_params A JSON array of data of
additional parameters
15